Well, not important I guess. PLEASE PARDON MY LONG RESPONSE, but I want to make sure I give a true picture of what I have done.
a) This vehicle would spin the front wheels several feet at the red light. Now, it is very, very sluggish on take off (serveral years now). Once the rpm gets up, it performs very well. I have a cold air intake right into the air filter, through the hood scoop.
b) I can not find my print out now (check engine code) I will get it checked again at Auto Zone. It seams heater bank 1/2 failure, but this should not hurt, once the engine is hot. I forget the other. I have checked the o2 sensor, and even faked a signal 0-1 volt directly into the rear o2 plug going to ECM. No adjustment seem to affect the idle (the sensor produces voltage when heated with torch.
One thing I forgot to mention. Several years ago, when this thing began > low millage, (I had forgot and was not sure for a long time). A friend of mine put a new exhaust gasket on the engine. That is when I first begin to feel the millage dropped the first time. When I finally checked it, 25 mpg or so. It is mostly always 20-28 mpg. and mostly stays low. When I changed the timing belt, I had the battery loose off weeks, I guess. I did clean the computer plugs, and found large amounts of oil on one of them. After I got everything going again, the first millage produced 39.1 mpg. Next time 30 mpg,, Since then it has been going back to 'normal' 25 mpg, mostly.
General info > The reason for changing timing belt was PM. The vehicle had cut off one day when I went to back up. After belt replacement, I checked coil, wires, cleaned ECM plugs, checked position sensors etc, When I got ready to go again, it still had NO FIRE as before. I worked backwards and finally found a fuse to Fuel Pump blown (why I do not know) Never before or after. SIMPLE solution, huh? I did spend hours getting a new belt...
1) Anything special about changing the exhaust manifold gasket to cause this poor gas millage, ie, new leak, cut wire, gasket on wrong, etc. ?
2) Does the ECM computer have oil inside for any reason? if so, it is leaking out...
By the way. The 'check engine lite' came on yesterday, was on a few miles this morning, and is now off again.
Thanks a bunch for your info, time and patience, so far. If you read all this, you are a GREAT guy. You have stimulated me to keep checking things. There should be some fix for this thing. LIKE ALL PROBLEMs, ONCE FIXED, THE PROBLEM AND SOLUTION WILL SEEM SIMPLE.
Photo result of BROKE neon and having to drive my Dodge Ram truck 12-15 mpg
Saturday, September 26th, 2009 AT 9:42 AM